LINEAR HEAT SENSING DETECTION VJ System Sensor India 2014
Linear Heat Sensing Cable: LINEAR - Across the Length HEAT - Heating of Cable SENSOR - Detector LHS Cable - Cable capable of detecting heating of cable over its entire length. 2
Codes / Regulations for Linear Heat Sensing Cable 3
Designing Parameters as Per NFPA 72 2010 NFPA Clause 3.3.43.10 Line-Type Detector - A device in which detection is continuous along a path. Typical examples are rate-of-rise pneumatic tubing detectors, projected beam smoke detectors, and heat-sensitive cable. (SIG-IDS) NFPA Clause A 3.3.43.7 Fixed-Temperature Detector. Electrical Conductivity. A line-type or spot-type sensing element in which resistance varies as a function of temperature. H eat-sensitive Cable. A line-type device in which the sensing element comprises, in one type, two current-carrying wires separated by heat-sensitive insulation that softens at the rated temperature, thus allowing the wires to make electrical contact. In another type, a single wire is centred in a metallic tube, and the intervening space is filled with a substance that becomes conductive at a critical temperature, thus establishing electrical contact between the tube and the wire. 4
Designing Parameters as Per NFPA 72 2010 NFPA Clause A3.3.43.18 Rate-of-Rise Detector- A line-type or spot-type sensing element in which resistance changes due to a change in temperature. The rate of change of resistance is monitored by associated control equipment, and an alarm is initiated when the rate of temperature increase exceeds a preset value. 5
Designing Parameters as Per IS 2189 : 2008 Type of Detector Suitability & Merits Unsuitability & Demerits Linear Heat Sensing Cables Cables Tunnels, Trays & Vaults, Material Conveyors, Bulk Storage, Multi-Racked Areas, Rim seals of floating roof tanks storing hazardous chemicals & a few other special occupancies Not suitable at all applications other than what is specified 6
Designing Parameters as Per IS 2189 : 2008 7
Design Guidelines/Standards for Linear Heat Sensing Cable 8
LHS Cable Calculation 9
Technical Specification for Linear Heat Sensing Cable 10
Types of Linear Heat Sensing Cables Digital: A small diameter cable which consist of sensing elements which respond to a specific temperature at any point along their length. The inner conductors are coated with a polymer that melts at a predetermined temperature which allows the conductors to make contact with one another and thereby signal an alarm condition at fire alarm panel. Analogue: A co-axial cable which exerts a defined change in electrical resistance of internal polymers when subjected to changes in surface temperatures. System monitoring through an associated electronic interface unit provides fault indication of open and short circuit conditions on the sensor cable. 11
System Sensor Linear Heat Series Digital Series - UK SD LD 68-155 SD LD 78-172 SD LD 88-190 SD LD 105-220 Approved by UL AND FM 900 Analogue Series - China JTW-LD-997 JTW-LCD-998 Approved by UL 12
800 Series Digital Linear Heat Detector Introduction Digital Linear Heat Detector (68 ) SD LD 68-155 Digital Linear Heat Detector (78 ) SD LD 78-172 Digital Linear Heat Detector (88 ) SD LD -88-190 Digital Linear Heat Detector (105 ) SD LD 105-220 Features 1. Fixed alarm temperature 2. Melts at alarm temperature to trigger the alarm signal Pros: Reasonable price Cons: Non-restorable after alarm 13
Digital Linear Heat Sensing Cable UL/FM Approved Upto 3000 mtr. of Cable per zone. Multiple Alarm Temp. 68 / 78 / 88 / 105 Degree C Multiple alarm temperatures combined in one zone. Three different type of Sheathing options: PVC, Nylon, Polypropylene. 14
Digital Linear Heat Sensing Cable UL/FM Approved 15
Digital Linear Heat Sensing Cable UL/FM Approved 16
Alarm Point Distance Locator FM Approved 17
900 Series Analogue Linear Heat Detector Introduction Fixed Temperature Analogue Linear Heat Detector (Restorable) JTW-LD-997 Rate-Of-Rise and Fixed Temperature Analogue Linear Heat Detector (Restorable) JTW-LCD-998 Features 1. Alarm Temp can be set between 70-130 130 with PC Modulator 2. Dual stage alarm settings (Pre-alarm & alarm) 3. Open and short circuit watch 4. Reusable coaxial cable (if not damaged in the fire) 5. System Reset with PC modulator 6. Cable cover protects from wearing-out and EMI 18
Analogue Linear Heat Sensing Cable The product includes the heat-detecting cable, the PC Modulator, the EOL box and connecting box. Cable is connected with a Start Point PC Modulator and with End Point EOL Box. The Control Module continuously monitors the detecting cable and/or alarms for the temperature rate of rise signal and open or short circuit faults. 19
PC Modulator Start Point PC Modulator is a microprocessor based start point device between LHS Cable and FAP. Modulator is a intelligent device that monitors LHS cable for continuity and over temperature fire signatures. Alarm Temperatures between 70 130 Degree C can be set thru PC Modulator. PC Modulator monitors the resistance of the sensor cable, and generate an alarm. System automatically resets after alarming at a temperature <= 120 Degree C with PC Modulator. Dual Alarm Setting ( Pre alarm and Alarm) Compatible with any Fire Control Panel 20
Design Consideration Digital Cable 24VDC Power Supply Power Signal Line Monitor Module Fire Control Panel MB 3000 Mtr. MB EOL BOX Digital Linear Heat Sensing Cable Digital - Max Zone Length 3000 Mtr. Digital Std. Roll Length 100 Mtr / 500 Mtr / 1000Mtr.. For every Zone 1 No. EOL Box. For every zone length exceeding std. roll length but within max. zone length Connecting Box is required. 21
Design Consideration Analogue cable 24VDC Power Supply Power Signal Line Monitor Module Fire Control Panel PC MODULATOR MB 200 Mtr. EOL BOX Analogue Linear Heat Sensing Cable Analogue - Max Zone Length 200 Mtr. Analogue Std. Roll Length 200 Mtr. For every Zone 1 No. PC Modulator and 1 No. EOL Box. 22
Application Notes for Linear Heat Sensing Cable 23
Applications Multiple applications across Various Verticals: Cable tray system Conveyor System Refrigerated Storage Facilities Transportation Tunnels Cooling Towers Electrical Equipment and Switch Gear Transformers and Substations Warehouse Protection Refinery and Petrochemical Works 24
Application Notes Cable Trays In power generation plants Linear Heat Sensing Cables senses the overheat condition in a plant s cable tray system. Linear heat sensing cable shall be installed in cable trays in a sinusoidal pattern across the tray. The total amount of linear heat sensing cable per tray is determined by the width of the cable tray and a multiplier calculated specifically for the width of the tray. Each zone shall be terminated with an appropriate end-of-line resistor. 25
Application Notes - Conveyor Fire in a typical coal conveyor is usually caused by friction due to belt slippage, bearing problems, static electricity, welding, or spontaneous combustion. Due to the relatively severe environment in coal conveyors, fire detection systems used in such applications must be engineered for this type of service. The SS Linear Heat Sensing Cable meet these requirements. They are specifically engineered to withstand abrasive coal dust, moisture, and highly corrosive atmospheres. 26
Application Notes - Tunnels Railway tunnels contain system power cables, communication and auxiliary operating cables, running the full length of the tunnel. Overheat and fire caused by catenary arcing, trackside sparks, under car mechanical failures and electrical short circuits are but a few of the potentially dangerous sources of fire within this aggressive environment. The application of Analogue linear heat detection cable in tunnels is the most suitable method of fire detection in view of its high reliability, low maintenance, and long monitoring lengths available. 27
Thank You 28